SOPRA 4897 is an SBS-modified bitumen venting base sheet for use in approved multiply membrane and flashing assemblies. SOPRA 4897 is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with a high quality random glass fiber mat. The topside is surfaced with fine mineral aggregate while the underside is surfaced with mineral granules to facilitate venting characteristics.
- Component Base
- Installation Method Mechanically Attached
- Reinforcement Glass Fiber
- Thickness 120 mils (3.1 mm)
- Topside Sanded
- Underside Sanded
Prior to installation, unroll SOPRA 4897 onto the roof surface and allow to relax. Position SOPRA 4897 in desired position and fasten to nailable substrate. Subsequent approved inter-ply or cap ply membranes are applied to SOPRA 4897 via cold adhesive or heat welding. Refer to the SOPREMA SBS Roofing Guide for additional application guidelines.
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From the beginning, the architect designing the Walter Reed Community Center was asked to include a vegetative roof within the blueprints. The goal was a LEED certified Silver level building.
CSU Maritime Academy – Vallejo, California
California Maritime Academy chose SOPREMA®’s SOPRALENE® SG cap sheet because it meets Title 24 cool roof standards. The California Energy Commission’s Title 24 Energy Efficiency Standards for Residential and Nonresidential Buildings establishes prescriptive requirements for cool roof materials in new construction or major re-roofing projects.